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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CXX-2007] Hidden Indexes</title>
                <link>https://jira.mongodb.org/browse/CXX-2007</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>
&lt;h4&gt;&lt;a name=&quot;DescriptionofDriversTicket%3A&quot;&gt;&lt;/a&gt;Description of Drivers Ticket:&lt;/h4&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;TBD when the project completes.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;This project implements functionality to allow indexes to be hidden from the query planner.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;As MongoDB users evolve schemas and tune performance, they are often in a position where dropping an index could improve query performance and reduce collection overhead. However, dropping an index comes with the risk that an application or script may depend on an index for acceptable performance and recreating can take substantial time.&lt;/p&gt;

&lt;p&gt;Allowing users to hide an index provides the opportunity to evaluate impact on user workloads. Restoring the index can then be done quickly, without having to undergo the time and expense of a full index build.&lt;/p&gt;

&lt;p&gt;Additionally, adding an index can cause a negative change in performance, if the query planner starts using the new index over a preferable existing index. Creating an index that is hidden on build completion allows users to make it visible at a suitable time for evaluation.&lt;/p&gt;

&lt;p&gt;Hiding an index only allows for plan selection evaluation and does not reduce the cost of maintenance. Index removal will still be required to reclaim disk space and improve write performance.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner: Katya Kamenieva&lt;/li&gt;
	&lt;li&gt;Project Lead: James Wahlin&lt;/li&gt;
	&lt;li&gt;Program Manager: Craig Homa&lt;/li&gt;
&lt;/ul&gt;


&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;

&lt;p&gt;&lt;a href=&quot;http://tinyurl.com/vu9jwys&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/tqrq4sa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Specs commit:&#160;&lt;a href=&quot;https://github.com/mongodb/specifications/commit/fafb0076e3c2ee8c35497bd1260c1cfc672c4919&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/commit/fafb0076e3c2ee8c35497bd1260c1cfc672c4919&lt;/a&gt;&lt;br/&gt;
    See &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-816&quot; title=&quot;Hidden Indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-816&quot;&gt;&lt;del&gt;DRIVERS-816&lt;/del&gt;&lt;/a&gt; for updated details.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1338969">CXX-2007</key>
            <summary>Hidden Indexes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="clyde.bazile@mongodb.com">Clyde Bazile III</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 May 2020 16:30:23 +0000</created>
                <updated>Sat, 28 Oct 2023 11:27:03 +0000</updated>
                            <resolved>Thu, 30 Jul 2020 16:22:06 +0000</resolved>
                                                    <fixVersion>3.6.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3314103" author="xgen-internal-githook" created="Thu, 30 Jul 2020 16:21:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Clyde Bazile&apos;, &apos;email&apos;: &apos;34226620+bazile-clyde@users.noreply.github.com&apos;, &apos;username&apos;: &apos;bazile-clyde&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-2007&quot; title=&quot;Hidden Indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-2007&quot;&gt;&lt;del&gt;CXX-2007&lt;/del&gt;&lt;/a&gt; hidden indexes support (#703)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/df80c58a9c3fee1feafca4dda508aa7ca3f57a1d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/df80c58a9c3fee1feafca4dda508aa7ca3f57a1d&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1120615">DRIVERS-816</issuekey>
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            <issuekey id="1338968">CDRIVER-3646</issuekey>
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